Table show common constants used in physics and chemistry.

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Constant | Symbol or definitional formula | Value |

Speed of light in vacuum | $c$ | $2,9979250 \cdot 10^8 \frac{m}{s}$ |

Elementary charge | $e$ | $1,602176 \cdot 10^{-19} C$ |

Avogadro's number | $N_{A}$ | $6,022169 \cdot 10^{23} \frac{1}{mol}$ |

Atomic mass constant | $u^d$ | $1,660531 \cdot 10^{-27} kg$ |

Mass of electron | $m_e$ | $9,109558 \cdot 10^{-31} kg$ |

Mass of proton | $m_p$ | $1,672614 \cdot 10^{-27} kg$ |

Faraday's constant | $F$ | $9,648670 \cdot 10^{4} \frac{C}{mol}$ |

Planck's constant | $h$ | $6,626196 \cdot 10^{-34} J \cdot s$ |

Fine structure constant | $\alpha$ | $7,297351 \cdot 10^{-3}$ |

Charge to mass ratio of the electron | $\frac{e}{m_e}$ | $1,7588028 \cdot 10^{11} \frac{C}{kg}$ |

Magnetic flux quantum | $\phi_0 = \frac{h}{2e}$ | $2,0678538 \cdot 10^{-15} Wb$ |

Rydberg's constant | $R_{\infty}$ | $1,09737312 \cdot 10^{7} \frac{1}{m}$ |

Bohr radius | $a_0$ | $5,2917715 \cdot 10^{-11} m$ |

Compton wavelength of the electron | $\lambda_c$ | $2,4263096 \cdot 10^{-12} m$ |

Electron radius | $r_e$ | $2,817939 \cdot 10^{-15} m$ |

Compton wavelength of the proton | ${\lambda}_p$ | $1,3214409 \cdot 10^{-15} m$ |

Gyromagnetic ratio of the proton with diamagnetic H2O correction | ${\gamma}_p$ | $2,6751965 \cdot 10^{8} \frac{rad}{s} \cdot T$ |

Gyromagnetic ratio of the proton | $\gamma^{'}_{p}$ | $2,6751270 \cdot 10^{8} \frac{rad}{s} \cdot T$ |

Bohr magneton | $\mu B$ | $9,274096 \cdot 10^{-24} \frac{J}{T}$ |

Nuclear magneton | $\mu_N$ | $5,050951 \cdot 10^{-27} \frac{J}{T}$ |

Magnetic momentic of the proton | $\mu_p$ | $1,4106203 \cdot 10^{-26} \frac{J}{T}$ |

Gas constant | $R$ | $8,31434 \frac{J}{mol} \cdot K$ |

Boltzmann's constant | $k$ | $1,380622 \cdot 10^{-23} \frac{J}{K}$ |

First radiation constant | $c_1$ | $4,992579 \cdot 10^{-24} J \cdot m$ |

Second radiation constant | $c_2$ | $1,438833 \cdot 10^{-2} m \cdot K$ |

Stefan-Blotzmann's constant | $\sigma$ | $5,66961 \cdot 10^{-8} \frac{W}{m^2} \cdot K^4$ |

Gravitional constant | $G$ | $6,6732 \cdot 10^{-11} \frac{N}{m^2} \cdot kg^2$ |

Molar volume of gas under normal condition | $V_0$ | $2,24136 \cdot 10^{-2} \frac{m^3}{mol}$ |

Vacuum permittivity | $\epsilon_0$ | $8,8542 \cdot 10^{-12} \frac{F}{m}$ |

- Physical constants (sometimes called chemical depending on context) are
**physical quantities**, whose**value doesn't depend on time or space**. Simply put, value of physical constant is always the same no matter**when**and**where**it is measured. - There are many physical equations containing one or more physical constants. Often they play a role of
**proportionality coefficient**. Examples of such equations may be:- Clapeyron's equation (perfect gas equation):

$pv = n\fbox{R}T$where:

- p = pressure,

- v = volume,

- n = number of moles,

- T = termodynamic temperature,

,**R = gas constant**

- p = pressure,
- the force of gravity, i.e. the force that attracts two bodies with masses:

$F = \fbox{G} \times \frac{m_1 \times m_2}{r_{12}}$where:

- F = force of gravity,

,**G = gravitional constant**

- m
_{1}= mass of the first body,

- m
_{2}= mass of the second body,

- r = distance between bodies,

- F = force of gravity,
- photon's energy:

$E_{photon} = \frac{\fbox{h} \times \fbox{c}}{ \lambda}$where:

,**h = Planck's constant**

,**c = speed of light in vacuum**

- λ = wavelength.

- Clapeyron's equation (perfect gas equation):

This is permalink. Permalink is the link containing your input data. Just copy it and share your work with friends:

- wikipedia: physical constant
- physisc.nist.gov: CODATA Internationally recommended 2014 values of the fundamental physical constants
- scienceblogs.com: are the fundamental constants really constant?
- school-for-champions.com: how to measure gravitational constant (Cavendish's experiment)
- smarterthanthat.com: how to measure the speed of light at home?

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